Catalogue Search | MBRL
Are you sure you want to remove the book from the shelf?
{{itemTitle}}
13,517
result(s) for
"Big bang cosmology"
Sort by:
Big bang! : the tongue-tickling tale of a speck that became spectacular
Discusses the big-bang theory of how a tiny speck became the universe we know today.
Book
Quantum singularities in a solvable toy model
Via elementary examples it is demonstrated that the singularities of classical physics (sampled by the Big Bang in cosmology) need not necessarily get smeared out after quantization. It is proposed that the role of quantum singularities can be played by the so called Kato’s exceptional-point spectral degeneracies.
Journal Article
Cosmology and the evolution of the universe
Covers the current scientific understanding of the creation and evolution of the universe.
Book
Explaining the Big Bang
The Big Bang is the cause of every event in our Universe and hence it explains all subsequent cosmic history. But can the Big Bang itself be explained? This paper explores a number of different styles of explanation that might be offered. These include causal explanations of the Big Bang either by a physical or a non-physical cause: here the paper focusses especially on Roger Penrose’s conformal cyclic cosmology. They also include non-causal explanations of the Big Bang in terms of an underlying physical or non-physical fundamental basis for the Universe or in terms of fundamental physical laws.
Journal Article
Quarks, leptons and the big bang
\"Quarks, Leptons and The Big Bang, Third Edition, is a clear, readable and self-contained introduction to particle physics and related areas of cosmology. It bridges the gap between non-technical popular accounts and textbooks for advanced students. The book concentrates on presenting the subject from the modern perspective of quarks, leptons and the forces between them. This book will be of interest to students, teachers and general science readers interested in fundamental ideas of modern physics. This edition brings the book completely up to date by including advances in particle physics and cosmology, such as the discovery of the Higgs boson, the LIGO gravitational wave discovery and the WMAP and PLANCK results. FEATURES Builds on the success of previous editions, which have received very complimentary reviews Focuses on key ideas as they are now, rather than taking a historical approach Restricted use of mathematics, making the book suitable for high school or first-year university level This third edition incorporates advances in particle physics and cosmology Written in an accessible yet rigorous style\"-- Provided by publisher.
Book
A small and vigorous black hole in the early Universe
Several theories have been proposed to describe the formation of black hole seeds in the early Universe and to explain the emergence of very massive black holes observed in the first thousand million years after the Big Bang
1
–
3
. Models consider different seeding and accretion scenarios
4
–
7
, which require the detection and characterization of black holes in the first few hundred million years after the Big Bang to be validated. Here we present an extensive analysis of the JWST-NIRSpec spectrum of GN-z11, an exceptionally luminous galaxy at
z
= 10.6, revealing the detection of the [Ne
iv
]
λ
2423 and CII*
λ
1335 transitions (typical of active galactic nuclei), as well as semi-forbidden nebular lines tracing gas densities higher than 10
9
cm
−3
, typical of the broad line region of active galactic nuclei. These spectral features indicate that GN-z11 hosts an accreting black hole. The spectrum also reveals a deep and blueshifted CIV
λ
1549 absorption trough, tracing an outflow with velocity 800−1,000 km s
−1
, probably driven by the active galactic nucleus. Assuming local virial relations, we derive a black hole mass of
log
(
M
BH
/
M
⊙
)
=
6.2
±
0.3
, accreting at about five times the Eddington rate. These properties are consistent with both heavy seeds scenarios and scenarios considering intermediate and light seeds experiencing episodic super-Eddington phases. Our finding explains the high luminosity of GN-z11 and can also provide an explanation for its exceptionally high nitrogen abundance.
An extensive analysis of the JWST-NIRSpec spectrum of GN-z11 shows a supermassive black hole of a few million solar masses in a galaxy 440 million years after the Big Bang.
Journal Article
New models and big bang nucleosynthesis constraints in f(Q) gravity
The
f
(
Q
) theories of modified gravity arise from the consideration of non-metricity as the basic geometric quantity, and have been proven to be very efficient in describing the late-time Universe. We use the Big Bang Nucleosynthesis (BBN) formalism and observations in order to extract constraints on various classes of
f
(
Q
) models. In particular, we calculate the deviations that
f
(
Q
) terms bring on the freeze-out temperature
T
f
in comparison to that of the standard
Λ
CDM evolution, and then we impose the observational bound on
δ
T
f
T
f
to extract constraints on the involved parameters of the considered models. Concerning the polynomial model, we show that the exponent parameter should be negative, while for the power-exponential model and the new hyperbolic tangent-power model we find that they pass the BBN constraints trivially. Finally, we examine two DGP-like
f
(
Q
) models, and we extract the bounds on their model parameters. Since many gravitational modifications, although able to describe the late-time evolution of the Universe, produce too-much modification at early times and thus fall to pass the BBN confrontation, the fact that
f
(
Q
) gravity can safely pass the BBN constraints is an important advantage of this modified gravity class.
Journal Article
The onset of star formation 250 million years after the Big Bang
A fundamental quest of modern astronomy is to locate the earliest galaxies and study how they influenced the intergalactic medium a few hundred million years after the Big Bang
1
–
3
. The abundance of star-forming galaxies is known to decline
4
,
5
from redshifts of about 6 to 10, but a key question is the extent of star formation at even earlier times, corresponding to the period when the first galaxies might have emerged. Here we report spectroscopic observations of MACS1149-JD1
6
, a gravitationally lensed galaxy observed when the Universe was less than four per cent of its present age. We detect an emission line of doubly ionized oxygen at a redshift of 9.1096 ± 0.0006, with an uncertainty of one standard deviation. This precisely determined redshift indicates that the red rest-frame optical colour arises from a dominant stellar component that formed about 250 million years after the Big Bang, corresponding to a redshift of about 15. Our results indicate that it may be possible to detect such early episodes of star formation in similar galaxies with future telescopes.
Observation of the emission line of doubly ionized oxygen at a redshift of 9.1096 reveals that star formation began at a redshift of about 15, around 250 million years after the Big Bang.
Journal Article